body{
    background-color: #818181;
}
#calculator{
    width:300px;
    height: 410px;
    margin-top: 10%;
    margin-right: auto;
    margin-left: auto;
    background-color: #dfd8d0;
    border: 2px solid #908b85;
    border-radius: 20px;
    box-shadow: 7px 10px 34px 1px rgba(0,0,0,0.68), inset -1px -6px 12px 0.1px #89847e;
}
#entrybox{
    width:80%;
    height: 65px;
    margin-right: auto;
    margin-left: auto;
    background-color: #c3c2ab;
    border-radius: 6px;
    border: 2px solid #b4b39d;
}
.entry{
    margin-right: 10px;
    font-size: 18px;
}
#buttons{
    width: 280px;
    height:auto;
    margin-left: 15px;
    margin-top: 15px;
    display: inline-block;
    position: absolute;
    color: #fff;
    font-size: 16px;
    font-weight: bold;
}
button{
    width:50px;
    height:40px;
    margin:0 4px 10px 8px;
    border: none;
    border-radius: 8px;
    background-color: #3a3a3a;
    box-shadow: 0 3px 0 0 #222121, inset -1px -3px 10px 1px #515151;
}
button:active{
    transform: translate(0,3px);
    box-shadow: none;
}
#equal-button{
    height: 90px;
    margin-top: -50px;
    margin-left: 12px;
    position: absolute;
}
#zero-button{
    width: 117px;
}
.red{
    background-color: #a72d45;
    box-shadow: 0 3px 0 0 #671c2a;
}
#footer{
    margin-top: 40px;
    font-size: 16px;
}